KR970007687B1 - Preparation process of high shrinkage polyester fiber - Google Patents

Abstract

Dimethyl terephthalate 10wt%, ethyleneglycol 70wt%, 2,2-bis-[4-(2-hydroxyethoxy)phenol propane 16.5wt%, 2,6-naphthalendicarbonic acid 7.5wt%, acetate 0.083wt%, antimony trioxide 0.038wt%, etc. are added to give the objective chip containing original viscosity 0.67 that is provided through the condensation polymer reaction for three hours at 260-265 degree C, the final inner temperature. This chip is melted, spun at the temperature 270 degree C to obtain the undrawn yarn, then dipped in an organic solvent composed of alkylpospate salt and polyoxyethyleneamideter component.

Description

High shrink polyester fiber manufacturing method

The present invention relates to a method for producing a highly shrinkable polyester fiber that can be used for fabrics, and more particularly, to an emulsion bath containing two or more emulsion components of an unstretched yarn obtained by copolymerization with a third component compound and another acid component. The present invention relates to a method for producing a high shrinkage polyester fiber for clothing and artificial leather, which is formed by dipping, stretching in two stages in a steam bath, and then semi-annealing heat treatment to express heat shrinkage stress and latent multistage high shrinkage characteristics.

Conventional techniques related to high shrink polyester fibers include a method of copolymerizing a third compound (US Pat. No. 3,927,167, Japanese Patent Application Laid-Open No. 53-134946), a method of changing the stretching conditions in hot water (Japanese Patent Application Laid-Open Publication No. 56-27608), a cooling effect, A method by changing the cooling position (Japanese Patent Laid-Open No. 1-97208), a method of stretching in hot water after polymerization reforming (US Pat. No. 3549597), and the like have been proposed.

However, the method of copolymerizing the third compound is difficult to apply to clothing because most shrinkage occurs during the non-water treatment process and dyeing, and the heat shrinkage stress and strength is lowered. Since the shrinkage rate is small, there is a problem that it is difficult to expect the desired physical properties.

An object of the present invention is to solve the above problems, after the first unstretched yarn obtained by copolymerizing 1 to 15 mol% of the entire polymer with a third component compound and another acid component in the emulsion bath, Stretching in two stages in a steam bath and performing semi-formal heat treatment at a constant temperature, the shrinkage is expressed step by step in the refining, shrinking, and dyeing process. Strength 5.5-6.5g / d, elongation 28-32%, heat shrinkage stress 0.6 It is to provide a method for producing a high shrinkage polyester fiber to express a dry heat shrinkage of 35% or more at ~ 1.0g / d, 180 ℃ × 20 minutes.

The main component of the polymer used in the present invention is a copolymer of two components having 85 to 99 mol% of structural units composed of polyethylene terephthalic acid and different from 1 to 15 mol% of structural units. The composition ratio of is 1.2: 1 to 2.5: 1, and examples of the component which can be used as the third component compound include 2, 2-bis- [4- (2-hydroxyethoxy) phenol] propane, 2, 2-di -(Hydroxypropoxyphenyl) propane and the like, and examples of other acid components include 1, 2-bis (4-carboxyphenoxy) ethane, 2, 6-naphthalenedicarboxylic acid, sebacic acid, adipic acid, and the like. . The third component compound used here is a nonlinear (bulky) structure, which increases the amorphous region in the polyester fiber, expresses high shrinkage properties without lowering the glass transition point, and another acid component is used to improve the mutual stress in the molecule. By giving it a latent multistage high shrinkage properties.

In general, the expression of the shrinkage in the fiber depends on the fraction and degree of orientation of the non-crystallized part. Thus, in the method for producing a high shrink polyester according to the present invention, the shrinkage property of the crystallized part in the arrangement of yarns is suppressed as much as possible. The stretching conditions were set in the fluid bath so that the regular arrangement of the fibrill, a fiber constituent unit, could be easily changed to the disordered structure by the appropriate temperature, to overcome the mutual stress in the fabric, A crystallization treatment method was employed to express.

Therefore, the unstretched yarn (sub-toe or multifilament) obtained by melt spinning the co-polyester described above was transferred to an emulsion bath composed of a phosphate-based and non-ionic compound having a temperature of 40-80 ° C. and an organic solvent concentration of 0.1-4%. 85 to 95% of stretching is performed in one stage, and two stages of stretching are performed in a steam bath at 15-5% of the total stretching. The total stretching ratio is 0.95 to 1.3 times the natural stretching ratio, and preferably 0.99 to 1.16. Pear is preferred. If the total draw ratio is larger than 1.3 times the natural draw ratio, the winding of the roller will occur, resulting in poor workability, and the potential multistage high shrinkage cannot be expected due to the increase in the degree of orientation and crystallization. It is difficult to use in clothing due to low strength.

In the present invention, in the production of high shrink polyester fibers, the shrinkage and shrinkage stress that could not be obtained only by changing the conventional stretching conditions and emulsions are in the range of Tg (glass transition point) +10 to Tg (glass transition point) + 60 ° C. It was possible to maintain more than a certain physical property by performing semi-formal heat treatment in the hot roller, and to minimize the change of unstretched yarn over time in post-processing (refining and shrinking process) to express the effect of shrinkage in the fabric.

Usually, high shrink polyester fiber is made through the process of crimping, drying, and cutting after stretching, but when it is carried out under such conditions, shrinkage decreases and it is difficult to use in clothing. After the two-stage stretching, the semi-formal heat treatment is performed so that the potential shrinkage occurs in multiple stages in the post-process (refining, reduction → reduction → preset → dyeing → final set).

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

100 parts by weight of dimethyl terephthalate, 70 parts by weight of ethylene glycol, 16.5 parts by weight of 2, 2-bis- [4- (2-hydroxyethoxy) phenol] propane, 7.5 parts by weight of 2, 6-naphthalenedicarboxylic acid, acetate 0.083 parts by weight, 0.038 parts by weight of antimony trioxide, and the like were added, and the unstretched yarn obtained by melt spinning at 270 ° C. after producing a chip having an intrinsic viscosity of 0.67 obtained by condensation polymerization reaction at a final internal temperature of 260 to 265 ° C. for 3 hours was alkyl. Submerged in a 60 ° C organic solvent solution composed of phosphate salt and polyoxyethylene amide ether, 90% single-stretched for the total draw ratio (0.9-1.3 times the natural draw ratio), and 10% 2-stage stretched in a steam bath. The physical properties of the yarn obtained by carrying out semi-formal heat treatment in parallel with a hot roller at a temperature of Tg + 30 ° C. were measured, and the dry heat shrinkage and the physical properties thereof are shown in Table 2.

Example 2

The undrawn yarn manufactured under the same conditions as in Example 1 was stretched by changing the draw ratio and heat treatment temperature as shown in Table 1, and the physical properties thereof were shown in Table 2.

Comparative Example 1

The non-drawn yarn obtained by using a general polymer different from Example 1 was stretched within the range of the examples of draw ratios and heat treatment temperature conditions as shown in Table 1, and the physical properties thereof were shown in Table 2.

Comparative Example 2-4

The unstretched yarn obtained by using the same polymer as in Example 1 was stretched by varying the emulsion bath temperature and heat treatment conditions as shown in Table 1, and the physical properties thereof were shown in Table 2 below.

TABLE 1

TABLE 2

Claims (3)

85 to 99 mol% of structural units are composed of polyethylene terephthalic acid, and 1 to 15 mol% of structural units are copolymerized components of 2, 2-bis- [4- (2-hydroxyethoxy) phenol] propane and 2, 2 A third component compound selected from -di- (hydroxypropoxy phenyl) propane, 1, 2-bis (4-carboxyphenoxy) ethane, 2, 6-naphthalenedicarboxylic acid, sebacic acid, adipic acid Another acid component was added at a ratio of 1.2: 1 to 2.5: 1, and the undrawn yarn including the copolymer was immersed in an emulsion bath at 40 to 80 ° C., followed by 85 to 95% single stage stretching of the entire drawing ratio, and then transferred to a steam bath. A 15 to 5% stretching ratio in two stages of stretching and semi-formal heat treatment in a hot roller at Tg + 10 to Tg + 60 ° C. for producing a high shrinkage polyester. The method of claim 1, wherein the emulsion bath is a method of producing a high shrink polyester, characterized in that consisting of 0.1-4% phosphate-based and non-ionic organic solvent. The method of claim 1, wherein the total draw ratio is 0.95 to 1.3 times the natural draw ratio.